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Message-Id: <6de1d7547b60677ad0b0f7ebcbc7ebc76a31dcf7.1649180962.git.lorenzo@kernel.org>
Date: Tue, 5 Apr 2022 19:53:15 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
lorenzo.bianconi@...hat.com, andrii@...nel.org,
jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
magnus.karlsson@...el.com, jbrouer@...hat.com, toke@...hat.com
Subject: [PATCH net-next] ixgbe: add xdp frags support to ndo_xdp_xmit
Add the capability to map non-linear xdp frames in XDP_TX and ndo_xdp_xmit
callback.
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 99 ++++++++++++-------
1 file changed, 63 insertions(+), 36 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index c4a4954aa317..8b84c9b2eecc 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -2344,6 +2344,7 @@ static int ixgbe_clean_rx_irq(struct ixgbe_q_vector *q_vector,
hard_start = page_address(rx_buffer->page) +
rx_buffer->page_offset - offset;
xdp_prepare_buff(&xdp, hard_start, offset, size, true);
+ xdp_buff_clear_frags_flag(&xdp);
#if (PAGE_SIZE > 4096)
/* At larger PAGE_SIZE, frame_sz depend on len size */
xdp.frame_sz = ixgbe_rx_frame_truesize(rx_ring, size);
@@ -8571,57 +8572,83 @@ static u16 ixgbe_select_queue(struct net_device *dev, struct sk_buff *skb,
int ixgbe_xmit_xdp_ring(struct ixgbe_ring *ring,
struct xdp_frame *xdpf)
{
- struct ixgbe_tx_buffer *tx_buffer;
- union ixgbe_adv_tx_desc *tx_desc;
- u32 len, cmd_type;
- dma_addr_t dma;
- u16 i;
-
- len = xdpf->len;
+ struct skb_shared_info *sinfo = xdp_get_shared_info_from_frame(xdpf);
+ u8 nr_frags = unlikely(xdp_frame_has_frags(xdpf)) ? sinfo->nr_frags : 0;
+ u16 i = 0, index = ring->next_to_use;
+ struct ixgbe_tx_buffer *tx_head = &ring->tx_buffer_info[index];
+ struct ixgbe_tx_buffer *tx_buff = tx_head;
+ union ixgbe_adv_tx_desc *tx_desc = IXGBE_TX_DESC(ring, index);
+ u32 cmd_type, len = xdpf->len;
+ void *data = xdpf->data;
- if (unlikely(!ixgbe_desc_unused(ring)))
+ if (unlikely(ixgbe_desc_unused(ring) < 1 + nr_frags))
return IXGBE_XDP_CONSUMED;
- dma = dma_map_single(ring->dev, xdpf->data, len, DMA_TO_DEVICE);
- if (dma_mapping_error(ring->dev, dma))
- return IXGBE_XDP_CONSUMED;
+ tx_head->bytecount = xdp_get_frame_len(xdpf);
+ tx_head->gso_segs = 1;
+ tx_head->xdpf = xdpf;
- /* record the location of the first descriptor for this packet */
- tx_buffer = &ring->tx_buffer_info[ring->next_to_use];
- tx_buffer->bytecount = len;
- tx_buffer->gso_segs = 1;
- tx_buffer->protocol = 0;
+ tx_desc->read.olinfo_status =
+ cpu_to_le32(tx_head->bytecount << IXGBE_ADVTXD_PAYLEN_SHIFT);
- i = ring->next_to_use;
- tx_desc = IXGBE_TX_DESC(ring, i);
+ for (;;) {
+ dma_addr_t dma;
- dma_unmap_len_set(tx_buffer, len, len);
- dma_unmap_addr_set(tx_buffer, dma, dma);
- tx_buffer->xdpf = xdpf;
+ dma = dma_map_single(ring->dev, data, len, DMA_TO_DEVICE);
+ if (dma_mapping_error(ring->dev, dma))
+ goto unmap;
- tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ dma_unmap_len_set(tx_buff, len, len);
+ dma_unmap_addr_set(tx_buff, dma, dma);
+
+ cmd_type = IXGBE_ADVTXD_DTYP_DATA | IXGBE_ADVTXD_DCMD_DEXT |
+ IXGBE_ADVTXD_DCMD_IFCS | len;
+ tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
+ tx_desc->read.buffer_addr = cpu_to_le64(dma);
+ tx_buff->protocol = 0;
+
+ if (++index == ring->count)
+ index = 0;
+
+ if (i == nr_frags)
+ break;
+
+ tx_buff = &ring->tx_buffer_info[index];
+ tx_desc = IXGBE_TX_DESC(ring, index);
+ tx_desc->read.olinfo_status = 0;
+ data = skb_frag_address(&sinfo->frags[i]);
+ len = skb_frag_size(&sinfo->frags[i]);
+ i++;
+ }
/* put descriptor type bits */
- cmd_type = IXGBE_ADVTXD_DTYP_DATA |
- IXGBE_ADVTXD_DCMD_DEXT |
- IXGBE_ADVTXD_DCMD_IFCS;
- cmd_type |= len | IXGBE_TXD_CMD;
- tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
- tx_desc->read.olinfo_status =
- cpu_to_le32(len << IXGBE_ADVTXD_PAYLEN_SHIFT);
+ tx_desc->read.cmd_type_len |= cpu_to_le32(IXGBE_TXD_CMD);
/* Avoid any potential race with xdp_xmit and cleanup */
smp_wmb();
- /* set next_to_watch value indicating a packet is present */
- i++;
- if (i == ring->count)
- i = 0;
-
- tx_buffer->next_to_watch = tx_desc;
- ring->next_to_use = i;
+ tx_head->next_to_watch = tx_desc;
+ ring->next_to_use = index;
return IXGBE_XDP_TX;
+
+unmap:
+ for (;;) {
+ tx_buff = &ring->tx_buffer_info[index];
+ if (dma_unmap_len(tx_buff, len))
+ dma_unmap_page(ring->dev, dma_unmap_addr(tx_buff, dma),
+ dma_unmap_len(tx_buff, len),
+ DMA_TO_DEVICE);
+ dma_unmap_len_set(tx_buff, len, 0);
+ if (tx_buff == tx_head)
+ break;
+
+ if (!index)
+ index += ring->count;
+ index--;
+ }
+
+ return IXGBE_XDP_CONSUMED;
}
netdev_tx_t ixgbe_xmit_frame_ring(struct sk_buff *skb,
--
2.35.1
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